CN102052702A - Heating system and method by using power plant steam turbine bearing cooling water through heat pump - Google Patents

Heating system and method by using power plant steam turbine bearing cooling water through heat pump Download PDF

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CN102052702A
CN102052702A CN 201010551122 CN201010551122A CN102052702A CN 102052702 A CN102052702 A CN 102052702A CN 201010551122 CN201010551122 CN 201010551122 CN 201010551122 A CN201010551122 A CN 201010551122A CN 102052702 A CN102052702 A CN 102052702A
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heat
steam turbine
heat pump
steam
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CN102052702B (en
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于刚
张永生
张光
卞双
鞠翠玲
邢长燕
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North China Electric Power University
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency

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Abstract

本发明属于能源领域的一种电厂轴承冷却水热泵供暖系统及方法,该系统由汽轮机、汽轮机轴承冷却系统、蒸汽吸收式热泵、水水换热器、低压加热器、热网加热器以及相应的管路和附属设备组成。该系统利用电厂轴承冷却水作为吸收式热泵的低温热源,在汽轮机组中做过功的中压蒸汽为热泵的驱动热源,在吸收式热泵系统中换热,其疏水送到汽轮机组回热系统中作为锅炉给水,热泵系统获得的高温热源中的热量在冬天单独或和传统热电联产系统耦合向外供给热用户,在夏天通过水水换热器的回热加热器加热汽轮机组的凝结水提高锅炉给水温度。从而降低了电厂汽轮机组轴承温度,实现了机组的安全运行,并且将热量通过热泵向外输出供热,提高了汽轮机组的热经济性。

Figure 201010551122

The invention belongs to the field of energy and relates to a bearing cooling water heat pump heating system and method in a power plant. The system consists of a steam turbine, a steam turbine bearing cooling system, a steam absorption heat pump, a water-water heat exchanger, a low-pressure heater, a heat network heater and corresponding Composed of piping and ancillary equipment. The system uses the bearing cooling water of the power plant as the low-temperature heat source of the absorption heat pump, and the medium-pressure steam that has done work in the steam turbine unit is used as the driving heat source of the heat pump. It exchanges heat in the absorption heat pump system, and its water is sent to the steam turbine unit for heat recovery system. As the boiler feed water, the heat from the high-temperature heat source obtained by the heat pump system is supplied to the heat user in winter alone or coupled with the traditional cogeneration system, and the condensate of the steam turbine unit is heated in summer by the regenerative heater of the water-to-water heat exchanger Increase boiler feed water temperature. Thus, the bearing temperature of the steam turbine unit in the power plant is reduced, the safe operation of the unit is realized, and the heat is output to the outside through the heat pump for heat supply, which improves the thermal economy of the steam turbine unit.

Figure 201010551122

Description

电厂汽轮机轴承冷却水热泵供暖系统及方法 Power plant steam turbine bearing cooling water heat pump heating system and method

技术领域technical field

本发明属于能源领域,特别涉及一种电厂汽轮机轴承冷却水热泵的供暖系统及方法,该系统通过电厂汽轮机轴承冷却水热泵的工作,降低了电厂汽轮机组轴承温度实现了机组的安全运行,另一方面将获得的热量通过热泵向外输出供热,实现了能量的梯级利用,提高了汽轮机组系统的热经济性。The invention belongs to the field of energy, and particularly relates to a heating system and method for a steam turbine bearing cooling water heat pump in a power plant. The system reduces the bearing temperature of the steam turbine unit bearing in the power plant through the operation of the steam turbine bearing cooling water heat pump in the power plant and realizes the safe operation of the unit. On the one hand, the obtained heat is output to the outside through the heat pump for heat supply, which realizes the cascade utilization of energy and improves the thermal economy of the steam turbine unit system.

技术背景technical background

热力发电厂汽轮机组的轴承冷却是影响机组运行安全的问题之一,汽轮机高速运行时,轴承内摩擦会产生大量的热量,如果轴承温度过高,会引起机组的振动甚至停机。机组运行中通过轴承内的润滑油系统不断循环流动能将这些热量带走,然后润滑油被另外的冷却水系统冷却,从而对机组运行起到散热冷却作用。实际运行中,这里的冷却水系统需要外界环境来进行冷却降低温度,大量的热量被浪费到环境中,另一方面,夏天由于环境温度高,冷却效果差,轴承冷却经常效果不佳影响整个汽轮机组的运行。The bearing cooling of the steam turbine unit in a thermal power plant is one of the problems that affect the safety of the unit operation. When the steam turbine is running at high speed, the internal friction of the bearing will generate a lot of heat. If the bearing temperature is too high, it will cause the unit to vibrate or even shut down. During the operation of the unit, the heat can be taken away by the continuous circulation of the lubricating oil system in the bearing, and then the lubricating oil is cooled by another cooling water system, so as to play a cooling role in the operation of the unit. In actual operation, the cooling water system here needs the external environment to cool down and lower the temperature, and a large amount of heat is wasted into the environment. On the other hand, in summer, due to the high ambient temperature, the cooling effect is poor, and the cooling effect of the bearing is often not good enough to affect the entire steam turbine. group run.

发明内容Contents of the invention

本发明提出一种电厂汽轮机组轴承冷却水热泵供暖系统及方法。The invention provides a heating system and method for a steam turbine unit bearing cooling water heat pump in a power plant.

一种电厂汽轮机组轴承冷却水热泵供暖系统,其特征在于该系统包括汽轮机、汽轮机轴承冷却系统、蒸汽吸收式热泵、水水换热器、低压加热器和热网加热器;该系统的汽轮机1的机轴连接汽轮机轴承冷却系统3,汽轮机轴承冷却系统3通过循环冷却水管路连接蒸汽吸收式热泵7的蒸发器7-2;汽轮机1的抽汽通过管道连接蒸汽吸收式热泵7的发生器7-1,发生器7-1中冷却后形成的疏水的通过疏水管道连接到汽轮机回热系统的低压加热器6的给水侧;蒸汽吸收式热泵7的冷凝器7-4的供水端连接供水三通阀9,供水三通阀9的一路连接供给热用户11的热网加热器10,冷凝器7-4的的回水端通过回水三通阀8连接供给热用户11的热网加热器10形成水循环回路;供水三通阀9和回水三通阀8分别连接汽轮机回热系统的水水换热器5高温水侧管路两端;汽轮机回热系统的水水换热器5的低温水侧的两端分别连接低压加热器6的给水侧和凝结水泵4侧相关对应温度的回热加热器出水端。A steam turbine unit bearing cooling water heat pump heating system in a power plant is characterized in that the system includes a steam turbine, a steam turbine bearing cooling system, a steam absorption heat pump, a water-to-water heat exchanger, a low-pressure heater and a heat network heater; the steam turbine 1 of the system The shaft of the steam turbine is connected to the steam turbine bearing cooling system 3, and the steam turbine bearing cooling system 3 is connected to the evaporator 7-2 of the steam absorption heat pump 7 through a circulating cooling water pipeline; the extraction steam of the steam turbine 1 is connected to the generator 7 of the steam absorption heat pump 7 through a pipeline -1, the drain formed after cooling in the generator 7-1 is connected to the feed water side of the low-pressure heater 6 of the steam turbine recuperation system through the drain pipe; the water supply end of the condenser 7-4 of the steam absorption heat pump 7 is connected to the water supply 3 The one way valve 9 and the water supply three-way valve 9 are connected to the heat network heater 10 supplied to the heat user 11, and the return water end of the condenser 7-4 is connected to the heat network heater supplied to the heat user 11 through the return water three-way valve 8 10 forms a water circulation loop; the water supply three-way valve 9 and the return water three-way valve 8 are respectively connected to the two ends of the water-water heat exchanger 5 of the steam turbine recovery system; the two ends of the water-water heat exchanger 5 of the steam turbine recovery system Both ends of the low-temperature water side are respectively connected to the feed water side of the low-pressure heater 6 and the water outlet end of the regenerative heater corresponding to the corresponding temperature on the side of the condensate pump 4 .

一种电厂轴承冷却水热泵的供暖方法,其特征在于,所述电厂轴承冷却水热泵供暖是利用电厂汽轮机轴承冷却水作为吸收式热泵的低温热源,通过发电汽轮机中做过功的较低压力的蒸汽作为热泵的驱动热源,热泵高温热源获得的热量在冬天用于供暖,在夏天连接汽轮机的给水加热系统加热锅炉给水。A heating method for a bearing cooling water heat pump of a power plant, characterized in that the heating of the bearing cooling water heat pump of the power plant uses the cooling water of the bearing cooling water of the steam turbine of the power plant as the low-temperature heat source of the absorption heat pump, and uses the low-pressure heat generated by the work done in the power generation steam turbine Steam is used as the driving heat source of the heat pump. The heat obtained by the high-temperature heat source of the heat pump is used for heating in winter, and the feed water heating system connected to the steam turbine is used to heat the boiler feed water in summer.

本发明的有益效果是一方面降低了电厂汽轮机组轴承温度实现了机组的安全运行,另一方面热泵系统高温热源中获得的热量在冬天向外供给热用户,在夏天通过换热器加热汽轮机组的凝结水提高锅炉给水温度。The beneficial effect of the invention is that on the one hand, the bearing temperature of the steam turbine unit in the power plant is reduced to realize the safe operation of the unit; on the other hand, the heat obtained from the high-temperature heat source of the heat pump system is supplied to the heat user in winter, and the steam turbine unit is heated through a heat exchanger in summer The condensed water increases the boiler feed water temperature.

附图说明Description of drawings

图1是电厂汽轮机组轴承冷却水热泵的供暖系统结构形式示意图。Figure 1 is a schematic diagram of the structural form of the heating system of the steam turbine unit bearing cooling water heat pump in the power plant.

图中:1是汽轮机,2是凝汽器,3是汽轮机轴承冷却系统,4是凝结水泵,5是水水换热器,6是低压加热器,7是蒸汽吸收式热泵,8是回水三通阀,9是供水三通阀,10是热网加热器,11是热用户,7-1是发生器,7-2是蒸发器,7-3是节流装置,7-4是冷凝器。In the figure: 1 is the steam turbine, 2 is the condenser, 3 is the cooling system of the steam turbine bearing, 4 is the condensate pump, 5 is the water-water heat exchanger, 6 is the low-pressure heater, 7 is the steam absorption heat pump, 8 is the return water Three-way valve, 9 is a water supply three-way valve, 10 is a heat network heater, 11 is a heat user, 7-1 is a generator, 7-2 is an evaporator, 7-3 is a throttling device, 7-4 is a condensation device.

具体实施方式Detailed ways

本发明提出一种电厂汽轮机组轴承冷却水热泵供暖系统及方法。The invention provides a heating system and method for a steam turbine unit bearing cooling water heat pump in a power plant.

下面结合附图和具体实施例进一步详细描述本发明。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

实施例1Example 1

图1是电厂汽轮机组轴承冷却水热泵的供暖系统结构形式示意图,该系统包括汽轮机、凝汽器、汽轮机轴承冷却系统、蒸汽吸收式热泵、凝结水泵、水水换热器、低压加热器、供回水三通阀、热网加热器以及附属设备等,采用相应的管路连接组成。Figure 1 is a schematic diagram of the heating system structure of the steam turbine unit bearing cooling water heat pump, the system includes a steam turbine, condenser, steam turbine bearing cooling system, steam absorption heat pump, condensate pump, water-water heat exchanger, low-pressure heater, supply The return water three-way valve, heating network heater and auxiliary equipment, etc., are composed of corresponding pipeline connections.

具体工作流程如下:汽轮机1的排汽进入凝汽器2中凝结为水,经凝结水泵4、低压加热器6等组成的回热系统后送往锅炉作为给水;汽轮机1在高速旋转中放出的热量通过汽轮机轴承冷却系统3冷却,循环水冷却管路连接蒸汽吸收式热泵7的蒸发器7-2作为吸收式热泵7的低温热源;汽轮机1中做过功的抽汽通过管道连接蒸汽吸收式热泵7的发生器7-1,该蒸汽作为吸收式热泵7的驱动热源,蒸汽放热后被冷却,冷却形成的疏水通过疏水管道连接到汽轮机回热系统的低压加热器6作为锅炉给水的一部分;冷凝器7-4为蒸汽吸收式热泵7的高温热源,它向外界放出热量,冷凝器7-4中的高温水连接供水三通阀9;在冬天,通过供水三通阀9的切换,蒸汽吸收式热泵7产生的高温水供给热网加热器10并进一步供给热用户用于供暖;在夏天,通过供水三通阀9的切换,蒸汽吸收式热泵7产生的高温水通过水水换热器5加热汽轮机回热系统的给水;热网加热器10和加热器5都是水水换热器,其回水都连接回水三通阀8,通过三通阀连接蒸汽吸收式热泵7的冷凝器7-4,形成水循环回路;节流装置7-3连接在冷凝器7-4和蒸发器7-2的一端,发生器7-1连接在冷凝器7-4和蒸发器7-2的另一端。The specific working process is as follows: the exhaust steam of steam turbine 1 enters the condenser 2 to condense into water, and then is sent to the boiler as feed water through the heat recovery system composed of condensate pump 4 and low-pressure heater 6; the exhaust steam released by steam turbine 1 during high-speed rotation The heat is cooled by the steam turbine bearing cooling system 3, and the circulating water cooling pipeline is connected to the evaporator 7-2 of the steam absorption heat pump 7 as the low-temperature heat source of the absorption heat pump 7; The generator 7-1 of the heat pump 7, the steam is used as the driving heat source of the absorption heat pump 7, and the steam is cooled after releasing heat, and the drain formed by cooling is connected to the low-pressure heater 6 of the steam turbine recovery system through the drain pipe as part of the boiler feed water Condenser 7-4 is the high-temperature heat source of steam absorption heat pump 7, and it emits heat to the outside world, and the high-temperature water in condenser 7-4 connects water supply three-way valve 9; In winter, by the switch of water supply three-way valve 9, The high-temperature water generated by the steam absorption heat pump 7 is supplied to the heat network heater 10 and further supplied to heat users for heating; in summer, through the switching of the water supply three-way valve 9, the high-temperature water generated by the steam absorption heat pump 7 is exchanged through water and water Heater 5 heats the feed water of the steam turbine recuperation system; the heat network heater 10 and the heater 5 are both water-to-water heat exchangers, and their return water is connected to the return water three-way valve 8, which is connected to the steam absorption heat pump 7 through the three-way valve The condenser 7-4 forms a water circulation loop; the throttling device 7-3 is connected to one end of the condenser 7-4 and the evaporator 7-2, and the generator 7-1 is connected to the condenser 7-4 and the evaporator 7-2 the other end.

最后,还需要注意的是,以上列举的仅是本发明的具体实施例。显然,本发明不限于以上实施例,还可以有许多变形。Finally, it should also be noted that what is listed above are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible.

本发明可用其他的不违背本发明的精神和主要特征的具体形式来概述。因此,本发明的上述实施方案都只能认为是对本发明的说明而不能限制本发明,权利要求书指出了本发明的范围,而上述的说明并未全部指出本发明的范围。因此,在与本发明的权利要求书相当的含义和范围内的任何改变,都应认为是包括在权利要求书的范围内。The present invention may be embodied in other specific forms without departing from the spirit and main characteristics of the invention. Therefore, the above-mentioned embodiments of the present invention can only be considered as descriptions of the present invention and cannot limit the present invention, and the scope of the present invention is pointed out by the claims, but the above-mentioned explanations do not all point out the scope of the present invention. Therefore, any changes within the meaning and scope equivalent to the claims of the present invention should be considered to be included in the scope of the claims.

Claims (2)

1. the heating system of power plant's bearing cooling water heat pump is characterized in that, this system comprises steam turbine, steam turbine bearing cooling system, steam absorption heat pump, water water-to-water heat exchanger, low-pressure heater and heat exchangers for district heating; The arbor of the steam turbine of this system (1) connects steam turbine bearing cooling system (3), and steam turbine bearing cooling system (3) connects the evaporimeter (7-2) of steam absorption heat pump (7) by the recirculated cooling water pipeline; Drawing gas of steam turbine (1) connects the generator (7-1) of steam absorption heat pump (7), the hydrophobic feedwater side that is connected to the low-pressure heater (6) of Steam Turbine Regenerative System by drain water piping of generator (7-1) by pipeline; The water supply end of the condenser (7-4) of steam absorption heat pump (7) connects Water-supplying tee joint valve (9), a road of Water-supplying tee joint valve (9) connects the heat exchangers for district heating (10) of supplying with hot user (11), and the backwater end of condenser (7-4) connects the heat exchangers for district heating (10) of supplying with hot user (11) by backwater triple valve (8) and forms the loop; By the control of triple valve, in another loop, backwater triple valve (8) and Water-supplying tee joint valve (9) are connected water water-to-water heat exchanger (5) the high temperature heat release side of Steam Turbine Regenerative System respectively; The two ends of water water-to-water heat exchanger (5) the water at low temperature side of Steam Turbine Regenerative System connect the feed-water inlet of low-pressure heater (6) and the bleeder heater water side of condensate pump (4) side corresponding temperature respectively.
2. the heating method of power plant's bearing cooling water heat pump, it is characterized in that, described power plant bearing cooling water heat pump heating is to utilize the low-temperature heat source of power plant steam turbine bearing cooling water as absorption heat pump, the steam of the lower pressure by doing merit in the steam turbine is as the driving heat source of absorption heat pump, the heat that the heat pump high temperature heat source obtains is used for heating in winter, connect the feed heating system heating boiler feedwater of steam turbine in summer; Concrete workflow is as follows: steam turbine (1) steam discharge enters condenser (2) and is condensed into water, is sent to boiler as boiler feedwater after the heat regenerative system of condensate pump (4) and low-pressure heater (6) composition; Liberated heat is by steam turbine bearing cooling system (3) cooling in rotating at a high speed for steam turbine (1), and the cool cycles water lines connects the low-temperature heat source of the evaporimeter (7-2) of steam absorption heat pump (7) as absorption heat pump (7); Doing the part of merit in the steam turbine (1) draws gas by the generator (7-1) of pipeline connection steam absorption heat pump (7), this steam is as the driving heat source of absorption heat pump (7), be cooled after the steam heat release, the hydrophobic of cooling formation is connected to the part of the low-pressure heater (6) of Steam Turbine Regenerative System as boiler feedwater by drain water piping; Condenser (7-4) is the high temperature heat source of steam absorption heat pump (7), and it emits heat to the external world, and the high-temperature water in the condenser (7-4) connects Water-supplying tee joint valve (9); In winter, by the switching of Water-supplying tee joint valve (9), the high-temperature water that steam absorption heat pump (7) produces is supplied with heat exchangers for district heating (10) and is further supplied with hot user and is used for heating; In summer, by the switching of Water-supplying tee joint valve (9), the high-temperature water that steam absorption heat pump (7) produces is by the feedwater of water water-to-water heat exchanger (5) heating Steam Turbine Regenerative System; Heat exchangers for district heating (10) all is connected backwater triple valve (8) with its backwater of water water-to-water heat exchanger (5), by the condenser (7-4) of triple valve connection steam absorption heat pump (7), forms water-flow circuit.Like this, the heat in the heat pump high temperature heat source is outwards supplied with hot user in winter, the condensate water raising boiler feed temperature in summer by heat exchanger heating Steam Turbine.This method has reduced the safe operation that power plant steam turbine group bearing temperature has been realized unit on the one hand, on the other hand its heat is outwards exported the cascade utilization that heat supply has realized energy by heat pump, having improved with Steam Turbine power plant is the heat-economy of the central heating system at center.
CN 201010551122 2010-11-18 2010-11-18 Heating method by using power plant steam turbine bearing cooling water through heat pump Expired - Fee Related CN102052702B (en)

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CN102345895A (en) * 2011-07-20 2012-02-08 双良节能系统股份有限公司 Steam-water heating system for thermal power plant
CN103090358A (en) * 2013-01-23 2013-05-08 中国神华能源股份有限公司 Cooling water heat recovery system of power plant and heat recovery method
CN104776479A (en) * 2015-04-02 2015-07-15 南京祥源动力供应有限公司 Energy-saving boiler shaft waste heat recovery system
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CN107939464A (en) * 2017-12-21 2018-04-20 西安热工研究院有限公司 A kind of CHP Heating System and method of work based on absorption heat pump cycle
CN111780195A (en) * 2020-05-18 2020-10-16 华电电力科学研究院有限公司 A supercritical unit improved heat network hydrophobic system and its working method
CN115046189A (en) * 2022-05-24 2022-09-13 山东电力工程咨询院有限公司 Feedforward compensation based power plant condensed water system cooperative control system and method
CN116358020A (en) * 2023-03-23 2023-06-30 山西漳山发电有限责任公司 Multistage regenerative heating system for thermal power plant

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CN102345895A (en) * 2011-07-20 2012-02-08 双良节能系统股份有限公司 Steam-water heating system for thermal power plant
CN102345895B (en) * 2011-07-20 2013-06-05 双良节能系统股份有限公司 Steam-water heating system for thermal power plant
CN103090358A (en) * 2013-01-23 2013-05-08 中国神华能源股份有限公司 Cooling water heat recovery system of power plant and heat recovery method
CN104776479A (en) * 2015-04-02 2015-07-15 南京祥源动力供应有限公司 Energy-saving boiler shaft waste heat recovery system
CN105546564A (en) * 2016-01-06 2016-05-04 浙江浙能节能科技有限公司 Energy-saving recycling system for low-grade heat energy in smoke pollutant treatment of thermal power plant
CN106150567B (en) * 2016-07-26 2017-11-14 中国神华能源股份有限公司 The synergisting method of steam turbine synergistic device and steam turbine
CN106150567A (en) * 2016-07-26 2016-11-23 中国神华能源股份有限公司 Steam turbine synergistic device and the synergisting method of steam turbine
CN107939464A (en) * 2017-12-21 2018-04-20 西安热工研究院有限公司 A kind of CHP Heating System and method of work based on absorption heat pump cycle
CN107939464B (en) * 2017-12-21 2024-03-01 西安热工研究院有限公司 Combined heat and power generation heating system based on absorption heat pump cycle and working method
CN111780195A (en) * 2020-05-18 2020-10-16 华电电力科学研究院有限公司 A supercritical unit improved heat network hydrophobic system and its working method
CN111780195B (en) * 2020-05-18 2021-09-03 华电电力科学研究院有限公司 Supercritical unit improved heat supply network drainage system and working method thereof
CN115046189A (en) * 2022-05-24 2022-09-13 山东电力工程咨询院有限公司 Feedforward compensation based power plant condensed water system cooperative control system and method
CN115046189B (en) * 2022-05-24 2025-02-28 山东电力工程咨询院有限公司 Coordinated control system and method for condensate system in power plant based on feedforward compensation
CN116358020A (en) * 2023-03-23 2023-06-30 山西漳山发电有限责任公司 Multistage regenerative heating system for thermal power plant
CN116358020B (en) * 2023-03-23 2025-06-13 山西漳山发电有限责任公司 A multi-stage heat recovery heating system for thermal power plants

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